Your first pay gap report measures a year that has already started. Most employers are preparing for the wrong one.

The most common planning mistake on the EU Pay Transparency Directive is treating the reporting deadline as the moment compliance begins. It is not. A pay gap report is a backward-looking document. It measures a calendar year that has already closed. By the time you sit down to produce the report, the data is fixed and the opportunity to change it has passed.

For an employer with 250 or more employees, the first report is due on 7 June 2027. Under Article 9, that report covers the previous calendar year, which is 2026. In other words, the pay decisions being made right now, in the year currently underway, are the data that report will publish. The deadline that actually constrains you is not June 2027. It is 31 December 2026, the day the reference year closes.

This distinction sounds technical. It is the single most important thing to get right in your preparation, because it changes when you have to act. This article sets out which year's data feeds your first report, what counts as pay in that year, and why the reference year, not the report date, is the deadline that binds you.

The reporting date and the data year are two different things

Article 9 of the directive sets the reporting obligation. The information an employer must publish, the gender pay gap, the gap in variable components, the proportion of women and men in each pay quartile, and the gap by category of worker, relates to the previous calendar year. The report is filed in year N. The data describes year N minus one.

The reporting cadence and the first deadline depend on headcount. Larger employers report sooner and more often. Exhibit 1 sets out the bands, the first report date, and, critically, the reference year each first report measures.

Read Exhibit 1 across, not down. The number that matters for your planning is in the third column. If you employ 250 people, your first report does not start with a clean sheet in 2027. It opens the books on 2026, a year that is already half spent. Every promotion, every off-cycle adjustment, every bonus decision taken between January and December 2026 is part of the dataset you will publish.

Employers in the 150 to 249 band are in the same position on the first report. They report less often after that, once every three years, but the first reference year is still 2026. Only the 100 to 149 band has genuine room, with a first reference year of 2030.

What counts as "pay" in the reference year

The reference year is not a single day. This is where the EU model differs from the United Kingdom's gender pay gap regime, which freezes pay on a snapshot date each April. The directive does not work that way.

Article 3 defines pay level using gross annual pay and the corresponding gross hourly pay. That is an annual-flow concept. It captures the whole year of earnings, including the basic salary plus the variable and complementary components: bonuses, overtime, shift premiums, allowances, and any other consideration the worker receives in connection with their employment. A bonus paid in March and a shift premium earned in October both sit inside the same reference year.

The practical consequence is that you cannot prepare for the report by looking at base salaries alone. A company can have near-identical base pay across a comparable work group and still report a material gap once a full year of variable pay is added in. Variable components are frequently where gaps hide, because they are awarded with more discretion and less structure than base salary.

This also means the measurement period is long. You are not capturing a moment. You are capturing twelve months of decisions, which is twelve months in which a gap can open or close.

Why the reference year, not the report date, is the deadline

Here is the conclusion that follows from everything above: by the time the report is due, it is too late to improve the result. A report run in early 2027 on 2026 data can only describe what happened. It cannot change it. If the 2026 gap is 9 per cent, the report says 9 per cent.

The only point at which the number can be moved is during the reference year itself, while pay decisions are still being made. For a 2026 reference year, that means the annual compensation round that closes in 2026 is the last structured opportunity to address a gap before it is locked into the first report. Miss it, and the next chance is the following year's round, which feeds the next report.

This is why the smarter operating rhythm is to run the analysis twice. A mid-year or pre-comp-round analysis on the current year's live data shows you the gap while you can still act on it, inside the raise cycle. A second, official run on the closed year produces the figure you actually file. Employers who only run the analysis once, after the year has closed, forfeit the ability to do anything about what they find.

The 5 per cent line matters here. Under Article 10, where a reported pay gap of at least 5 per cent in any category of worker cannot be justified on objective, gender-neutral grounds and is not remedied within six months, the employer must carry out a joint pay assessment with worker representatives. The reference-year framing changes how you should read that threshold. The cheapest time to get a group under 5 per cent is while the reference year is still open. The most expensive time is after the report has been filed and a joint assessment has been triggered.

Germany is the complicating case. It missed the 7 June 2026 transposition deadline, and the European Commission has not extended it. The Federal Ministry for Family Affairs has signalled that companies may be given until early 2028 to adapt, which would point to a first report in 2028 on 2027 data. That is a planning signal, and a reasonable one to track, but it is not law. No Referentenentwurf has been published. Until a German statute fixes a different date, the directive's own reference year remains the baseline, and the existing Entgelttransparenzgesetz duties continue to apply regardless.

The practical reading for a German employer is to prepare on the assumption that 2026 or 2027 pay data will be in scope, and to treat any delay as breathing room rather than a reprieve. The data year always sits one year ahead of the report. Whether your first German report lands in 2027 or 2028, the pay decisions it measures are being made now.

What to do now

The reference-year logic turns a 2027 deadline into a 2026 task. Four steps follow from it.

1. Fix your size band and your reference year. Confirm your headcount against the Article 9 thresholds and write down the exact year your first report will measure. For most employers above 150 staff, that is 2026. This single fact sets your whole timeline.
2. Run a dry analysis on the current year, before year-end. Do not wait for the closed year. Run the seven Article 9 metrics on your live data now, so you can see gaps while the reference year is still open and decisions can still be made.
3. Use the compensation round as the remediation lever. The pay round that closes the reference year is your last structured chance to move a gap before it is reported. Identify groups above the 5 per cent line and fund targeted, documented adjustments inside that round.
4. Freeze and report on the closed year. Once the reference year ends, run the official analysis on the final data, document your comparable work groups and any justification factors, and produce the report. By then the number should reflect a year you managed, not a year you merely recorded.

The year you report is the year you are living in

The reporting deadline gets the attention because it has a fixed date on it. The reference year is where the work actually happens. For most employers preparing for a June 2027 report, that year is 2026, and it is already underway. The number you will eventually publish is being written right now, one pay decision at a time, and the only time to change it is before the year closes.

This article is general information about the directive's reporting timeline and is not legal advice. The exact reference year, reporting format, and thresholds for your organisation will depend on your national transposition law once it is finalised.